Siponto (Latin: Sipontum) was an ancient port town of Apulia in southern Italy. The town was abandoned after earthquakes in the 13th century; today the area is administered as a frazione of the comune of Manfredonia, in the province of Foggia. Siponto is located around 3 km south of Manfredonia.

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According to legend, Sipontum was founded by Diomedes, product of the union of the Homeric hero of the same name with the daughter of the king of the Dauni. Siponto was probably founded by the Dauni.

Sipontum was a flourishing Greek colony; having fallen into the hands of the Samnites, it was retaken about 335 B. C. by King Alexander of Epirus, uncle of Alexander the Great. In 189 B. C. it became a Roman colony, and in A. D. 663 it was taken and destroyed by the Slavs.

In the ninth century, Sipontum was for a time in the power of the Saracens; ln 1042 the Normans made it the seat of one of their twelve counties. The latter won a decisive victory there over the Byzantine general Argyrus in 1052.

About 688 Pope Vitalian was obliged to entrust to the bishops of Benevento the pastoral care of Sipontum, which was almost abandoned, but the see was re-established in 1034, and under Bishop Saint Gerard (1066) it became an archdiocese. The ancient cathedral remained still at Sipontum, but, with the building of Manfredonia by King Manfred of Sicily, who decided to rebuild Siponto in a new location, the archiepiscopal see was transferred to the latter city.